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https://dev.mysql.com/doc/refman/9.7/en/server-status-variables.html
The MySQL server maintains many status variables that provide information about its operation. You can view these variables and their values by using the SHOW [GLOBAL | SESSION] STATUS statement (see Section 15.7.7.39, “SHOW STATUS Statement”).
https://dev.mysql.com/doc/refman/9.7/en/show-table-status.html
SHOW TABLE STATUS [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TABLE STATUS works like SHOW TABLES, but provides a lot of information about each non-TEMPORARY table. You can also get this list using the mysqlshow --status db_name ...
https://dev.mysql.com/doc/refman/9.7/en/srjs-api-using.html
This section discusses the use of the API in executing and in obtaining and processing results from both simple SQL statements and prepared statements. SQL execution in JavaScript is available in stored procedures only, and not in stored functions.
https://dev.mysql.com/doc/refman/9.7/en/srjs-data-arguments.html
Most MySQL data types are supported for MLE stored program input and output arguments, as well as for return data types. The data types are listed here: Integer: All variants and aliases of MySQL integer data types are supported, including TINYINT, ...
https://dev.mysql.com/doc/refman/9.7/en/string-type-syntax.html
The string data types are CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, and SET. In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement. For definitions of character ...
https://dev.mysql.com/doc/refman/9.7/en/sys-format-statement.html
Given a string (normally representing an SQL statement), reduces it to the length given by the statement_truncate_len configuration option, and returns the result. Otherwise, the middle part of the string is replaced by an ellipsis (...). This ...
https://dev.mysql.com/doc/refman/9.7/en/sys-schema-object-index.html
The following tables list sys schema objects and provide a short description of each one.
https://dev.mysql.com/doc/refman/9.7/en/table-size-limit.html
The effective maximum table size for MySQL databases is usually determined by operating system constraints on file sizes, not by MySQL internal limits. For up-to-date information operating system file size limits, refer to the documentation ...
https://dev.mysql.com/doc/refman/9.7/en/telemetry-metrics-meter-metrics.html
The following server metrics are registered by default: mysql.stats Metrics mysql.stats.com Metrics mysql.stats.connection Metrics mysql.perf_schema Metrics mysql.stats.handler Metrics mysql.stats.myisam Metrics mysql.stats.ssl Metrics mysql.inno ...
https://dev.mysql.com/doc/refman/9.7/en/thread-pool-operation.html
The thread pool consists of a number of thread groups, each of which manages a set of client connections. As connections are established, the thread pool assigns them to thread groups in round-robin fashion. The thread pool exposes system variables ...